1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in.c 8.2 (Berkeley) 11/15/93 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_compat.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 72 #include <sys/param.h> 73 #include <sys/eventhandler.h> 74 #include <sys/errno.h> 75 #include <sys/jail.h> 76 #include <sys/malloc.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/systm.h> 81 #include <sys/priv.h> 82 #include <sys/proc.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/lock.h> 86 #include <sys/rmlock.h> 87 #include <sys/syslog.h> 88 89 #include <net/if.h> 90 #include <net/if_var.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 #include <net/if_dl.h> 94 #include <net/vnet.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <net/if_llatbl.h> 99 #include <netinet/if_ether.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet/ip_carp.h> 104 105 #include <netinet/ip6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/mld6_var.h> 109 #include <netinet6/ip6_mroute.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_fib.h> 113 #include <netinet6/in6_pcb.h> 114 115 /* 116 * struct in6_ifreq and struct ifreq must be type punnable for common members 117 * of ifr_ifru to allow accessors to be shared. 118 */ 119 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 120 offsetof(struct ifreq, ifr_ifru), 121 "struct in6_ifreq and struct ifreq are not type punnable"); 122 123 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 124 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 125 126 /* 127 * Definitions of some costant IP6 addresses. 128 */ 129 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 130 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 131 const struct in6_addr in6addr_nodelocal_allnodes = 132 IN6ADDR_NODELOCAL_ALLNODES_INIT; 133 const struct in6_addr in6addr_linklocal_allnodes = 134 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 135 const struct in6_addr in6addr_linklocal_allrouters = 136 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 137 const struct in6_addr in6addr_linklocal_allv2routers = 138 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 139 140 const struct in6_addr in6mask0 = IN6MASK0; 141 const struct in6_addr in6mask32 = IN6MASK32; 142 const struct in6_addr in6mask64 = IN6MASK64; 143 const struct in6_addr in6mask96 = IN6MASK96; 144 const struct in6_addr in6mask128 = IN6MASK128; 145 146 const struct sockaddr_in6 sa6_any = 147 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 148 149 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 150 struct in6_aliasreq *, int); 151 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 152 153 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 154 struct in6_ifaddr *, int); 155 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 156 struct in6_aliasreq *, int flags); 157 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 158 struct in6_ifaddr *, int, int); 159 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 160 struct in6_ifaddr *, int); 161 162 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 163 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 164 165 166 void 167 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 168 { 169 struct sockaddr_dl gateway; 170 struct sockaddr_in6 mask, addr; 171 struct rtentry rt; 172 int fibnum; 173 174 /* 175 * initialize for rtmsg generation 176 */ 177 bzero(&gateway, sizeof(gateway)); 178 gateway.sdl_len = sizeof(gateway); 179 gateway.sdl_family = AF_LINK; 180 181 bzero(&rt, sizeof(rt)); 182 rt.rt_gateway = (struct sockaddr *)&gateway; 183 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 184 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 185 rt_mask(&rt) = (struct sockaddr *)&mask; 186 rt_key(&rt) = (struct sockaddr *)&addr; 187 rt.rt_flags = RTF_HOST | RTF_STATIC; 188 if (cmd == RTM_ADD) 189 rt.rt_flags |= RTF_UP; 190 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 191 /* Announce arrival of local address to this FIB. */ 192 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 193 } 194 195 int 196 in6_mask2len(struct in6_addr *mask, u_char *lim0) 197 { 198 int x = 0, y; 199 u_char *lim = lim0, *p; 200 201 /* ignore the scope_id part */ 202 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 203 lim = (u_char *)mask + sizeof(*mask); 204 for (p = (u_char *)mask; p < lim; x++, p++) { 205 if (*p != 0xff) 206 break; 207 } 208 y = 0; 209 if (p < lim) { 210 for (y = 0; y < 8; y++) { 211 if ((*p & (0x80 >> y)) == 0) 212 break; 213 } 214 } 215 216 /* 217 * when the limit pointer is given, do a stricter check on the 218 * remaining bits. 219 */ 220 if (p < lim) { 221 if (y != 0 && (*p & (0x00ff >> y)) != 0) 222 return (-1); 223 for (p = p + 1; p < lim; p++) 224 if (*p != 0) 225 return (-1); 226 } 227 228 return x * 8 + y; 229 } 230 231 #ifdef COMPAT_FREEBSD32 232 struct in6_ndifreq32 { 233 char ifname[IFNAMSIZ]; 234 uint32_t ifindex; 235 }; 236 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 237 #endif 238 239 int 240 in6_control(struct socket *so, u_long cmd, caddr_t data, 241 struct ifnet *ifp, struct thread *td) 242 { 243 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 244 struct in6_ifaddr *ia = NULL; 245 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 246 struct sockaddr_in6 *sa6; 247 int carp_attached = 0; 248 int error; 249 u_long ocmd = cmd; 250 251 /* 252 * Compat to make pre-10.x ifconfig(8) operable. 253 */ 254 if (cmd == OSIOCAIFADDR_IN6) 255 cmd = SIOCAIFADDR_IN6; 256 257 switch (cmd) { 258 case SIOCGETSGCNT_IN6: 259 case SIOCGETMIFCNT_IN6: 260 /* 261 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 262 * We cannot see how that would be needed, so do not adjust the 263 * KPI blindly; more likely should clean up the IPv4 variant. 264 */ 265 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 266 } 267 268 switch (cmd) { 269 case SIOCAADDRCTL_POLICY: 270 case SIOCDADDRCTL_POLICY: 271 if (td != NULL) { 272 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 273 if (error) 274 return (error); 275 } 276 return (in6_src_ioctl(cmd, data)); 277 } 278 279 if (ifp == NULL) 280 return (EOPNOTSUPP); 281 282 switch (cmd) { 283 case SIOCSNDFLUSH_IN6: 284 case SIOCSPFXFLUSH_IN6: 285 case SIOCSRTRFLUSH_IN6: 286 case SIOCSDEFIFACE_IN6: 287 case SIOCSIFINFO_FLAGS: 288 case SIOCSIFINFO_IN6: 289 if (td != NULL) { 290 error = priv_check(td, PRIV_NETINET_ND6); 291 if (error) 292 return (error); 293 } 294 /* FALLTHROUGH */ 295 case OSIOCGIFINFO_IN6: 296 case SIOCGIFINFO_IN6: 297 case SIOCGNBRINFO_IN6: 298 case SIOCGDEFIFACE_IN6: 299 return (nd6_ioctl(cmd, data, ifp)); 300 301 #ifdef COMPAT_FREEBSD32 302 case SIOCGDEFIFACE32_IN6: 303 { 304 struct in6_ndifreq ndif; 305 struct in6_ndifreq32 *ndif32; 306 307 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 308 ifp); 309 if (error) 310 return (error); 311 ndif32 = (struct in6_ndifreq32 *)data; 312 ndif32->ifindex = ndif.ifindex; 313 return (0); 314 } 315 #endif 316 } 317 318 switch (cmd) { 319 case SIOCSIFPREFIX_IN6: 320 case SIOCDIFPREFIX_IN6: 321 case SIOCAIFPREFIX_IN6: 322 case SIOCCIFPREFIX_IN6: 323 case SIOCSGIFPREFIX_IN6: 324 case SIOCGIFPREFIX_IN6: 325 log(LOG_NOTICE, 326 "prefix ioctls are now invalidated. " 327 "please use ifconfig.\n"); 328 return (EOPNOTSUPP); 329 } 330 331 switch (cmd) { 332 case SIOCSSCOPE6: 333 if (td != NULL) { 334 error = priv_check(td, PRIV_NETINET_SCOPE6); 335 if (error) 336 return (error); 337 } 338 /* FALLTHROUGH */ 339 case SIOCGSCOPE6: 340 case SIOCGSCOPE6DEF: 341 return (scope6_ioctl(cmd, data, ifp)); 342 } 343 344 /* 345 * Find address for this interface, if it exists. 346 * 347 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 348 * only, and used the first interface address as the target of other 349 * operations (without checking ifra_addr). This was because netinet 350 * code/API assumed at most 1 interface address per interface. 351 * Since IPv6 allows a node to assign multiple addresses 352 * on a single interface, we almost always look and check the 353 * presence of ifra_addr, and reject invalid ones here. 354 * It also decreases duplicated code among SIOC*_IN6 operations. 355 */ 356 switch (cmd) { 357 case SIOCAIFADDR_IN6: 358 case SIOCSIFPHYADDR_IN6: 359 sa6 = &ifra->ifra_addr; 360 break; 361 case SIOCSIFADDR_IN6: 362 case SIOCGIFADDR_IN6: 363 case SIOCSIFDSTADDR_IN6: 364 case SIOCSIFNETMASK_IN6: 365 case SIOCGIFDSTADDR_IN6: 366 case SIOCGIFNETMASK_IN6: 367 case SIOCDIFADDR_IN6: 368 case SIOCGIFPSRCADDR_IN6: 369 case SIOCGIFPDSTADDR_IN6: 370 case SIOCGIFAFLAG_IN6: 371 case SIOCSNDFLUSH_IN6: 372 case SIOCSPFXFLUSH_IN6: 373 case SIOCSRTRFLUSH_IN6: 374 case SIOCGIFALIFETIME_IN6: 375 case SIOCGIFSTAT_IN6: 376 case SIOCGIFSTAT_ICMP6: 377 sa6 = &ifr->ifr_addr; 378 break; 379 case SIOCSIFADDR: 380 case SIOCSIFBRDADDR: 381 case SIOCSIFDSTADDR: 382 case SIOCSIFNETMASK: 383 /* 384 * Although we should pass any non-INET6 ioctl requests 385 * down to driver, we filter some legacy INET requests. 386 * Drivers trust SIOCSIFADDR et al to come from an already 387 * privileged layer, and do not perform any credentials 388 * checks or input validation. 389 */ 390 return (EINVAL); 391 default: 392 sa6 = NULL; 393 break; 394 } 395 if (sa6 && sa6->sin6_family == AF_INET6) { 396 if (sa6->sin6_scope_id != 0) 397 error = sa6_embedscope(sa6, 0); 398 else 399 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 400 if (error != 0) 401 return (error); 402 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 403 &sa6->sin6_addr)) != 0) 404 return (error); 405 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 406 } else 407 ia = NULL; 408 409 switch (cmd) { 410 case SIOCSIFADDR_IN6: 411 case SIOCSIFDSTADDR_IN6: 412 case SIOCSIFNETMASK_IN6: 413 /* 414 * Since IPv6 allows a node to assign multiple addresses 415 * on a single interface, SIOCSIFxxx ioctls are deprecated. 416 */ 417 /* we decided to obsolete this command (20000704) */ 418 error = EINVAL; 419 goto out; 420 421 case SIOCDIFADDR_IN6: 422 /* 423 * for IPv4, we look for existing in_ifaddr here to allow 424 * "ifconfig if0 delete" to remove the first IPv4 address on 425 * the interface. For IPv6, as the spec allows multiple 426 * interface address from the day one, we consider "remove the 427 * first one" semantics to be not preferable. 428 */ 429 if (ia == NULL) { 430 error = EADDRNOTAVAIL; 431 goto out; 432 } 433 /* FALLTHROUGH */ 434 case SIOCAIFADDR_IN6: 435 /* 436 * We always require users to specify a valid IPv6 address for 437 * the corresponding operation. 438 */ 439 if (ifra->ifra_addr.sin6_family != AF_INET6 || 440 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 441 error = EAFNOSUPPORT; 442 goto out; 443 } 444 445 if (td != NULL) { 446 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 447 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 448 if (error) 449 goto out; 450 } 451 /* FALLTHROUGH */ 452 case SIOCGIFSTAT_IN6: 453 case SIOCGIFSTAT_ICMP6: 454 if (ifp->if_afdata[AF_INET6] == NULL) { 455 error = EPFNOSUPPORT; 456 goto out; 457 } 458 break; 459 460 case SIOCGIFADDR_IN6: 461 /* This interface is basically deprecated. use SIOCGIFCONF. */ 462 /* FALLTHROUGH */ 463 case SIOCGIFAFLAG_IN6: 464 case SIOCGIFNETMASK_IN6: 465 case SIOCGIFDSTADDR_IN6: 466 case SIOCGIFALIFETIME_IN6: 467 /* must think again about its semantics */ 468 if (ia == NULL) { 469 error = EADDRNOTAVAIL; 470 goto out; 471 } 472 break; 473 } 474 475 switch (cmd) { 476 case SIOCGIFADDR_IN6: 477 ifr->ifr_addr = ia->ia_addr; 478 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 479 goto out; 480 break; 481 482 case SIOCGIFDSTADDR_IN6: 483 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 484 error = EINVAL; 485 goto out; 486 } 487 ifr->ifr_dstaddr = ia->ia_dstaddr; 488 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 489 goto out; 490 break; 491 492 case SIOCGIFNETMASK_IN6: 493 ifr->ifr_addr = ia->ia_prefixmask; 494 break; 495 496 case SIOCGIFAFLAG_IN6: 497 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 498 break; 499 500 case SIOCGIFSTAT_IN6: 501 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 502 ifp->if_afdata[AF_INET6])->in6_ifstat, 503 &ifr->ifr_ifru.ifru_stat, 504 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 505 break; 506 507 case SIOCGIFSTAT_ICMP6: 508 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 509 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 510 &ifr->ifr_ifru.ifru_icmp6stat, 511 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 512 break; 513 514 case SIOCGIFALIFETIME_IN6: 515 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 516 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 517 time_t maxexpire; 518 struct in6_addrlifetime *retlt = 519 &ifr->ifr_ifru.ifru_lifetime; 520 521 /* 522 * XXX: adjust expiration time assuming time_t is 523 * signed. 524 */ 525 maxexpire = (-1) & 526 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 527 if (ia->ia6_lifetime.ia6t_vltime < 528 maxexpire - ia->ia6_updatetime) { 529 retlt->ia6t_expire = ia->ia6_updatetime + 530 ia->ia6_lifetime.ia6t_vltime; 531 } else 532 retlt->ia6t_expire = maxexpire; 533 } 534 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 535 time_t maxexpire; 536 struct in6_addrlifetime *retlt = 537 &ifr->ifr_ifru.ifru_lifetime; 538 539 /* 540 * XXX: adjust expiration time assuming time_t is 541 * signed. 542 */ 543 maxexpire = (-1) & 544 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 545 if (ia->ia6_lifetime.ia6t_pltime < 546 maxexpire - ia->ia6_updatetime) { 547 retlt->ia6t_preferred = ia->ia6_updatetime + 548 ia->ia6_lifetime.ia6t_pltime; 549 } else 550 retlt->ia6t_preferred = maxexpire; 551 } 552 break; 553 554 case SIOCAIFADDR_IN6: 555 { 556 struct nd_prefixctl pr0; 557 struct nd_prefix *pr; 558 559 /* 560 * first, make or update the interface address structure, 561 * and link it to the list. 562 */ 563 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 564 goto out; 565 if (ia != NULL) { 566 if (ia->ia_ifa.ifa_carp) 567 (*carp_detach_p)(&ia->ia_ifa, true); 568 ifa_free(&ia->ia_ifa); 569 } 570 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 571 == NULL) { 572 /* 573 * this can happen when the user specify the 0 valid 574 * lifetime. 575 */ 576 break; 577 } 578 579 if (cmd == ocmd && ifra->ifra_vhid > 0) { 580 if (carp_attach_p != NULL) 581 error = (*carp_attach_p)(&ia->ia_ifa, 582 ifra->ifra_vhid); 583 else 584 error = EPROTONOSUPPORT; 585 if (error) 586 goto out; 587 else 588 carp_attached = 1; 589 } 590 591 /* 592 * then, make the prefix on-link on the interface. 593 * XXX: we'd rather create the prefix before the address, but 594 * we need at least one address to install the corresponding 595 * interface route, so we configure the address first. 596 */ 597 598 /* 599 * convert mask to prefix length (prefixmask has already 600 * been validated in in6_update_ifa(). 601 */ 602 bzero(&pr0, sizeof(pr0)); 603 pr0.ndpr_ifp = ifp; 604 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 605 NULL); 606 if (pr0.ndpr_plen == 128) { 607 /* we don't need to install a host route. */ 608 goto aifaddr_out; 609 } 610 pr0.ndpr_prefix = ifra->ifra_addr; 611 /* apply the mask for safety. */ 612 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 613 &ifra->ifra_prefixmask.sin6_addr); 614 615 /* 616 * XXX: since we don't have an API to set prefix (not address) 617 * lifetimes, we just use the same lifetimes as addresses. 618 * The (temporarily) installed lifetimes can be overridden by 619 * later advertised RAs (when accept_rtadv is non 0), which is 620 * an intended behavior. 621 */ 622 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 623 pr0.ndpr_raf_auto = 624 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 625 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 626 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 627 628 /* add the prefix if not yet. */ 629 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 630 /* 631 * nd6_prelist_add will install the corresponding 632 * interface route. 633 */ 634 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 635 if (carp_attached) 636 (*carp_detach_p)(&ia->ia_ifa, false); 637 goto out; 638 } 639 } 640 641 /* relate the address to the prefix */ 642 if (ia->ia6_ndpr == NULL) { 643 ia->ia6_ndpr = pr; 644 pr->ndpr_addrcnt++; 645 646 /* 647 * If this is the first autoconf address from the 648 * prefix, create a temporary address as well 649 * (when required). 650 */ 651 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 652 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 653 int e; 654 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 655 log(LOG_NOTICE, "in6_control: failed " 656 "to create a temporary address, " 657 "errno=%d\n", e); 658 } 659 } 660 } 661 nd6_prefix_rele(pr); 662 663 /* 664 * this might affect the status of autoconfigured addresses, 665 * that is, this address might make other addresses detached. 666 */ 667 pfxlist_onlink_check(); 668 669 aifaddr_out: 670 /* 671 * Try to clear the flag when a new IPv6 address is added 672 * onto an IFDISABLED interface and it succeeds. 673 */ 674 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 675 struct in6_ndireq nd; 676 677 memset(&nd, 0, sizeof(nd)); 678 nd.ndi.flags = ND_IFINFO(ifp)->flags; 679 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 680 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 681 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 682 "SIOCSIFINFO_FLAGS for -ifdisabled " 683 "failed."); 684 /* 685 * Ignore failure of clearing the flag intentionally. 686 * The failure means address duplication was detected. 687 */ 688 } 689 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 690 break; 691 } 692 693 case SIOCDIFADDR_IN6: 694 { 695 struct nd_prefix *pr; 696 697 /* 698 * If the address being deleted is the only one that owns 699 * the corresponding prefix, expire the prefix as well. 700 * XXX: theoretically, we don't have to worry about such 701 * relationship, since we separate the address management 702 * and the prefix management. We do this, however, to provide 703 * as much backward compatibility as possible in terms of 704 * the ioctl operation. 705 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 706 */ 707 pr = ia->ia6_ndpr; 708 in6_purgeaddr(&ia->ia_ifa); 709 if (pr != NULL && pr->ndpr_addrcnt == 0) { 710 ND6_WLOCK(); 711 nd6_prefix_unlink(pr, NULL); 712 ND6_WUNLOCK(); 713 nd6_prefix_del(pr); 714 } 715 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 716 break; 717 } 718 719 default: 720 if (ifp->if_ioctl == NULL) { 721 error = EOPNOTSUPP; 722 goto out; 723 } 724 error = (*ifp->if_ioctl)(ifp, cmd, data); 725 goto out; 726 } 727 728 error = 0; 729 out: 730 if (ia != NULL) 731 ifa_free(&ia->ia_ifa); 732 return (error); 733 } 734 735 736 /* 737 * Join necessary multicast groups. Factored out from in6_update_ifa(). 738 * This entire work should only be done once, for the default FIB. 739 */ 740 static int 741 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 742 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 743 { 744 char ip6buf[INET6_ADDRSTRLEN]; 745 struct in6_addr mltaddr; 746 struct in6_multi_mship *imm; 747 int delay, error; 748 749 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 750 751 /* Join solicited multicast addr for new host id. */ 752 bzero(&mltaddr, sizeof(struct in6_addr)); 753 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 754 mltaddr.s6_addr32[2] = htonl(1); 755 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 756 mltaddr.s6_addr8[12] = 0xff; 757 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 758 /* XXX: should not happen */ 759 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 760 goto cleanup; 761 } 762 delay = error = 0; 763 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 764 /* 765 * We need a random delay for DAD on the address being 766 * configured. It also means delaying transmission of the 767 * corresponding MLD report to avoid report collision. 768 * [RFC 4861, Section 6.3.7] 769 */ 770 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 771 } 772 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 773 if (imm == NULL) { 774 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 775 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 776 if_name(ifp), error)); 777 goto cleanup; 778 } 779 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 780 *in6m_sol = imm->i6mm_maddr; 781 782 /* 783 * Join link-local all-nodes address. 784 */ 785 mltaddr = in6addr_linklocal_allnodes; 786 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 787 goto cleanup; /* XXX: should not fail */ 788 789 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 790 if (imm == NULL) { 791 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 792 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 793 if_name(ifp), error)); 794 goto cleanup; 795 } 796 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 797 798 /* 799 * Join node information group address. 800 */ 801 delay = 0; 802 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 803 /* 804 * The spec does not say anything about delay for this group, 805 * but the same logic should apply. 806 */ 807 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 808 } 809 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 810 /* XXX jinmei */ 811 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 812 if (imm == NULL) 813 nd6log((LOG_WARNING, 814 "%s: in6_joingroup failed for %s on %s " 815 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 816 &mltaddr), if_name(ifp), error)); 817 /* XXX not very fatal, go on... */ 818 else 819 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 820 } 821 if (V_icmp6_nodeinfo_oldmcprefix && 822 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 823 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 824 if (imm == NULL) 825 nd6log((LOG_WARNING, 826 "%s: in6_joingroup failed for %s on %s " 827 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 828 &mltaddr), if_name(ifp), error)); 829 /* XXX not very fatal, go on... */ 830 else 831 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 832 } 833 834 /* 835 * Join interface-local all-nodes address. 836 * (ff01::1%ifN, and ff01::%ifN/32) 837 */ 838 mltaddr = in6addr_nodelocal_allnodes; 839 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 840 goto cleanup; /* XXX: should not fail */ 841 842 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 843 if (imm == NULL) { 844 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 845 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 846 &mltaddr), if_name(ifp), error)); 847 goto cleanup; 848 } 849 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 850 851 cleanup: 852 return (error); 853 } 854 855 /* 856 * Update parameters of an IPv6 interface address. 857 * If necessary, a new entry is created and linked into address chains. 858 * This function is separated from in6_control(). 859 */ 860 int 861 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 862 struct in6_ifaddr *ia, int flags) 863 { 864 int error, hostIsNew = 0; 865 866 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 867 return (error); 868 869 if (ia == NULL) { 870 hostIsNew = 1; 871 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 872 return (ENOBUFS); 873 } 874 875 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 876 if (error != 0) { 877 if (hostIsNew != 0) { 878 in6_unlink_ifa(ia, ifp); 879 ifa_free(&ia->ia_ifa); 880 } 881 return (error); 882 } 883 884 if (hostIsNew) 885 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 886 887 return (error); 888 } 889 890 /* 891 * Fill in basic IPv6 address request info. 892 */ 893 void 894 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 895 const struct in6_addr *mask) 896 { 897 898 memset(ifra, 0, sizeof(struct in6_aliasreq)); 899 900 ifra->ifra_addr.sin6_family = AF_INET6; 901 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 902 if (addr != NULL) 903 ifra->ifra_addr.sin6_addr = *addr; 904 905 ifra->ifra_prefixmask.sin6_family = AF_INET6; 906 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 907 if (mask != NULL) 908 ifra->ifra_prefixmask.sin6_addr = *mask; 909 } 910 911 static int 912 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 913 struct in6_ifaddr *ia, int flags) 914 { 915 int plen = -1; 916 struct sockaddr_in6 dst6; 917 struct in6_addrlifetime *lt; 918 char ip6buf[INET6_ADDRSTRLEN]; 919 920 /* Validate parameters */ 921 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 922 return (EINVAL); 923 924 /* 925 * The destination address for a p2p link must have a family 926 * of AF_UNSPEC or AF_INET6. 927 */ 928 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 929 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 930 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 931 return (EAFNOSUPPORT); 932 933 /* 934 * Validate address 935 */ 936 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 937 ifra->ifra_addr.sin6_family != AF_INET6) 938 return (EINVAL); 939 940 /* 941 * validate ifra_prefixmask. don't check sin6_family, netmask 942 * does not carry fields other than sin6_len. 943 */ 944 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 945 return (EINVAL); 946 /* 947 * Because the IPv6 address architecture is classless, we require 948 * users to specify a (non 0) prefix length (mask) for a new address. 949 * We also require the prefix (when specified) mask is valid, and thus 950 * reject a non-consecutive mask. 951 */ 952 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 953 return (EINVAL); 954 if (ifra->ifra_prefixmask.sin6_len != 0) { 955 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 956 (u_char *)&ifra->ifra_prefixmask + 957 ifra->ifra_prefixmask.sin6_len); 958 if (plen <= 0) 959 return (EINVAL); 960 } else { 961 /* 962 * In this case, ia must not be NULL. We just use its prefix 963 * length. 964 */ 965 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 966 } 967 /* 968 * If the destination address on a p2p interface is specified, 969 * and the address is a scoped one, validate/set the scope 970 * zone identifier. 971 */ 972 dst6 = ifra->ifra_dstaddr; 973 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 974 (dst6.sin6_family == AF_INET6)) { 975 struct in6_addr in6_tmp; 976 u_int32_t zoneid; 977 978 in6_tmp = dst6.sin6_addr; 979 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 980 return (EINVAL); /* XXX: should be impossible */ 981 982 if (dst6.sin6_scope_id != 0) { 983 if (dst6.sin6_scope_id != zoneid) 984 return (EINVAL); 985 } else /* user omit to specify the ID. */ 986 dst6.sin6_scope_id = zoneid; 987 988 /* convert into the internal form */ 989 if (sa6_embedscope(&dst6, 0)) 990 return (EINVAL); /* XXX: should be impossible */ 991 } 992 /* Modify original ifra_dstaddr to reflect changes */ 993 ifra->ifra_dstaddr = dst6; 994 995 /* 996 * The destination address can be specified only for a p2p or a 997 * loopback interface. If specified, the corresponding prefix length 998 * must be 128. 999 */ 1000 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1001 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1002 /* XXX: noisy message */ 1003 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1004 "be specified for a p2p or a loopback IF only\n")); 1005 return (EINVAL); 1006 } 1007 if (plen != 128) { 1008 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1009 "be 128 when dstaddr is specified\n")); 1010 return (EINVAL); 1011 } 1012 } 1013 /* lifetime consistency check */ 1014 lt = &ifra->ifra_lifetime; 1015 if (lt->ia6t_pltime > lt->ia6t_vltime) 1016 return (EINVAL); 1017 if (lt->ia6t_vltime == 0) { 1018 /* 1019 * the following log might be noisy, but this is a typical 1020 * configuration mistake or a tool's bug. 1021 */ 1022 nd6log((LOG_INFO, 1023 "in6_update_ifa: valid lifetime is 0 for %s\n", 1024 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1025 1026 if (ia == NULL) 1027 return (0); /* there's nothing to do */ 1028 } 1029 1030 /* Check prefix mask */ 1031 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1032 /* 1033 * We prohibit changing the prefix length of an existing 1034 * address, because 1035 * + such an operation should be rare in IPv6, and 1036 * + the operation would confuse prefix management. 1037 */ 1038 if (ia->ia_prefixmask.sin6_len != 0 && 1039 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1040 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1041 "of an existing %s address should not be changed\n", 1042 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1043 1044 return (EINVAL); 1045 } 1046 } 1047 1048 return (0); 1049 } 1050 1051 1052 /* 1053 * Allocate a new ifaddr and link it into chains. 1054 */ 1055 static struct in6_ifaddr * 1056 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1057 { 1058 struct in6_ifaddr *ia; 1059 1060 /* 1061 * When in6_alloc_ifa() is called in a process of a received 1062 * RA, it is called under an interrupt context. So, we should 1063 * call malloc with M_NOWAIT. 1064 */ 1065 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1066 if (ia == NULL) 1067 return (NULL); 1068 LIST_INIT(&ia->ia6_memberships); 1069 /* Initialize the address and masks, and put time stamp */ 1070 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1071 ia->ia_addr.sin6_family = AF_INET6; 1072 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1073 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1074 ia->ia_addr = ifra->ifra_addr; 1075 ia->ia6_createtime = time_uptime; 1076 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1077 /* 1078 * Some functions expect that ifa_dstaddr is not 1079 * NULL for p2p interfaces. 1080 */ 1081 ia->ia_ifa.ifa_dstaddr = 1082 (struct sockaddr *)&ia->ia_dstaddr; 1083 } else { 1084 ia->ia_ifa.ifa_dstaddr = NULL; 1085 } 1086 1087 /* set prefix mask if any */ 1088 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1089 if (ifra->ifra_prefixmask.sin6_len != 0) { 1090 ia->ia_prefixmask.sin6_family = AF_INET6; 1091 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1092 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1093 } 1094 1095 ia->ia_ifp = ifp; 1096 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1097 IF_ADDR_WLOCK(ifp); 1098 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1099 IF_ADDR_WUNLOCK(ifp); 1100 1101 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1102 IN6_IFADDR_WLOCK(); 1103 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1104 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1105 IN6_IFADDR_WUNLOCK(); 1106 1107 return (ia); 1108 } 1109 1110 /* 1111 * Update/configure interface address parameters: 1112 * 1113 * 1) Update lifetime 1114 * 2) Update interface metric ad flags 1115 * 3) Notify other subsystems 1116 */ 1117 static int 1118 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1119 struct in6_ifaddr *ia, int hostIsNew, int flags) 1120 { 1121 int error; 1122 1123 /* update timestamp */ 1124 ia->ia6_updatetime = time_uptime; 1125 1126 /* 1127 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1128 * to see if the address is deprecated or invalidated, but initialize 1129 * these members for applications. 1130 */ 1131 ia->ia6_lifetime = ifra->ifra_lifetime; 1132 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1133 ia->ia6_lifetime.ia6t_expire = 1134 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1135 } else 1136 ia->ia6_lifetime.ia6t_expire = 0; 1137 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1138 ia->ia6_lifetime.ia6t_preferred = 1139 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1140 } else 1141 ia->ia6_lifetime.ia6t_preferred = 0; 1142 1143 /* 1144 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1145 * userland, make it deprecated. 1146 */ 1147 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1148 ia->ia6_lifetime.ia6t_pltime = 0; 1149 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1150 } 1151 1152 /* 1153 * configure address flags. 1154 */ 1155 ia->ia6_flags = ifra->ifra_flags; 1156 1157 /* 1158 * Make the address tentative before joining multicast addresses, 1159 * so that corresponding MLD responses would not have a tentative 1160 * source address. 1161 */ 1162 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1163 1164 /* 1165 * DAD should be performed for an new address or addresses on 1166 * an interface with ND6_IFF_IFDISABLED. 1167 */ 1168 if (in6if_do_dad(ifp) && 1169 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1170 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1171 1172 /* notify other subsystems */ 1173 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1174 1175 return (error); 1176 } 1177 1178 /* 1179 * Do link-level ifa job: 1180 * 1) Add lle entry for added address 1181 * 2) Notifies routing socket users about new address 1182 * 3) join appropriate multicast group 1183 * 4) start DAD if enabled 1184 */ 1185 static int 1186 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1187 struct in6_ifaddr *ia, int flags) 1188 { 1189 struct in6_multi *in6m_sol; 1190 int error = 0; 1191 1192 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1193 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1194 in6_purgeaddr(&ia->ia_ifa); 1195 ifa_free(&ia->ia_ifa); 1196 return (error); 1197 } 1198 1199 /* Join necessary multicast groups. */ 1200 in6m_sol = NULL; 1201 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1202 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1203 if (error != 0) { 1204 in6_purgeaddr(&ia->ia_ifa); 1205 ifa_free(&ia->ia_ifa); 1206 return (error); 1207 } 1208 } 1209 1210 /* Perform DAD, if the address is TENTATIVE. */ 1211 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1212 int delay, mindelay, maxdelay; 1213 1214 delay = 0; 1215 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1216 /* 1217 * We need to impose a delay before sending an NS 1218 * for DAD. Check if we also needed a delay for the 1219 * corresponding MLD message. If we did, the delay 1220 * should be larger than the MLD delay (this could be 1221 * relaxed a bit, but this simple logic is at least 1222 * safe). 1223 * XXX: Break data hiding guidelines and look at 1224 * state for the solicited multicast group. 1225 */ 1226 mindelay = 0; 1227 if (in6m_sol != NULL && 1228 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1229 mindelay = in6m_sol->in6m_timer; 1230 } 1231 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1232 if (maxdelay - mindelay == 0) 1233 delay = 0; 1234 else { 1235 delay = 1236 (arc4random() % (maxdelay - mindelay)) + 1237 mindelay; 1238 } 1239 } 1240 nd6_dad_start((struct ifaddr *)ia, delay); 1241 } 1242 1243 in6_newaddrmsg(ia, RTM_ADD); 1244 ifa_free(&ia->ia_ifa); 1245 return (error); 1246 } 1247 1248 void 1249 in6_purgeaddr(struct ifaddr *ifa) 1250 { 1251 struct ifnet *ifp = ifa->ifa_ifp; 1252 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1253 struct in6_multi_mship *imm; 1254 int plen, error; 1255 1256 if (ifa->ifa_carp) 1257 (*carp_detach_p)(ifa, false); 1258 1259 /* 1260 * Remove the loopback route to the interface address. 1261 * The check for the current setting of "nd6_useloopback" 1262 * is not needed. 1263 */ 1264 if (ia->ia_flags & IFA_RTSELF) { 1265 error = ifa_del_loopback_route((struct ifaddr *)ia, 1266 (struct sockaddr *)&ia->ia_addr); 1267 if (error == 0) 1268 ia->ia_flags &= ~IFA_RTSELF; 1269 } 1270 1271 /* stop DAD processing */ 1272 nd6_dad_stop(ifa); 1273 1274 /* Leave multicast groups. */ 1275 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1276 LIST_REMOVE(imm, i6mm_chain); 1277 in6_leavegroup(imm); 1278 } 1279 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1280 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1281 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1282 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1283 if (error != 0) 1284 log(LOG_INFO, "%s: err=%d, destination address delete " 1285 "failed\n", __func__, error); 1286 ia->ia_flags &= ~IFA_ROUTE; 1287 } 1288 1289 in6_newaddrmsg(ia, RTM_DELETE); 1290 in6_unlink_ifa(ia, ifp); 1291 } 1292 1293 static void 1294 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1295 { 1296 char ip6buf[INET6_ADDRSTRLEN]; 1297 int remove_lle; 1298 1299 IF_ADDR_WLOCK(ifp); 1300 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1301 IF_ADDR_WUNLOCK(ifp); 1302 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1303 1304 /* 1305 * Defer the release of what might be the last reference to the 1306 * in6_ifaddr so that it can't be freed before the remainder of the 1307 * cleanup. 1308 */ 1309 IN6_IFADDR_WLOCK(); 1310 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1311 LIST_REMOVE(ia, ia6_hash); 1312 IN6_IFADDR_WUNLOCK(); 1313 1314 /* 1315 * Release the reference to the base prefix. There should be a 1316 * positive reference. 1317 */ 1318 remove_lle = 0; 1319 if (ia->ia6_ndpr == NULL) { 1320 nd6log((LOG_NOTICE, 1321 "in6_unlink_ifa: autoconf'ed address " 1322 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1323 } else { 1324 ia->ia6_ndpr->ndpr_addrcnt--; 1325 /* Do not delete lles within prefix if refcont != 0 */ 1326 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1327 remove_lle = 1; 1328 ia->ia6_ndpr = NULL; 1329 } 1330 1331 nd6_rem_ifa_lle(ia, remove_lle); 1332 1333 /* 1334 * Also, if the address being removed is autoconf'ed, call 1335 * pfxlist_onlink_check() since the release might affect the status of 1336 * other (detached) addresses. 1337 */ 1338 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1339 pfxlist_onlink_check(); 1340 } 1341 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1342 } 1343 1344 /* 1345 * Notifies other subsystems about address change/arrival: 1346 * 1) Notifies device handler on the first IPv6 address assignment 1347 * 2) Handle routing table changes for P2P links and route 1348 * 3) Handle routing table changes for address host route 1349 */ 1350 static int 1351 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1352 struct in6_aliasreq *ifra, int hostIsNew) 1353 { 1354 int error = 0, plen, ifacount = 0; 1355 struct ifaddr *ifa; 1356 struct sockaddr_in6 *pdst; 1357 char ip6buf[INET6_ADDRSTRLEN]; 1358 1359 /* 1360 * Give the interface a chance to initialize 1361 * if this is its first address, 1362 */ 1363 if (hostIsNew != 0) { 1364 IF_ADDR_RLOCK(ifp); 1365 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1366 if (ifa->ifa_addr->sa_family != AF_INET6) 1367 continue; 1368 ifacount++; 1369 } 1370 IF_ADDR_RUNLOCK(ifp); 1371 } 1372 1373 if (ifacount <= 1 && ifp->if_ioctl) { 1374 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1375 if (error) 1376 return (error); 1377 } 1378 1379 /* 1380 * If a new destination address is specified, scrub the old one and 1381 * install the new destination. Note that the interface must be 1382 * p2p or loopback. 1383 */ 1384 pdst = &ifra->ifra_dstaddr; 1385 if (pdst->sin6_family == AF_INET6 && 1386 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1387 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1388 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1389 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1390 "remove a route to the old destination: %s\n", 1391 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1392 /* proceed anyway... */ 1393 } else 1394 ia->ia_flags &= ~IFA_ROUTE; 1395 ia->ia_dstaddr = *pdst; 1396 } 1397 1398 /* 1399 * If a new destination address is specified for a point-to-point 1400 * interface, install a route to the destination as an interface 1401 * direct route. 1402 * XXX: the logic below rejects assigning multiple addresses on a p2p 1403 * interface that share the same destination. 1404 */ 1405 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1406 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1407 ia->ia_dstaddr.sin6_family == AF_INET6) { 1408 int rtflags = RTF_UP | RTF_HOST; 1409 /* 1410 * Handle the case for ::1 . 1411 */ 1412 if (ifp->if_flags & IFF_LOOPBACK) 1413 ia->ia_flags |= IFA_RTSELF; 1414 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1415 if (error) 1416 return (error); 1417 ia->ia_flags |= IFA_ROUTE; 1418 } 1419 1420 /* 1421 * add a loopback route to self if not exists 1422 */ 1423 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1424 error = ifa_add_loopback_route((struct ifaddr *)ia, 1425 (struct sockaddr *)&ia->ia_addr); 1426 if (error == 0) 1427 ia->ia_flags |= IFA_RTSELF; 1428 } 1429 1430 return (error); 1431 } 1432 1433 /* 1434 * Find an IPv6 interface link-local address specific to an interface. 1435 * ifaddr is returned referenced. 1436 */ 1437 struct in6_ifaddr * 1438 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1439 { 1440 struct ifaddr *ifa; 1441 1442 IF_ADDR_RLOCK(ifp); 1443 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1444 if (ifa->ifa_addr->sa_family != AF_INET6) 1445 continue; 1446 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1447 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1448 ignoreflags) != 0) 1449 continue; 1450 ifa_ref(ifa); 1451 break; 1452 } 1453 } 1454 IF_ADDR_RUNLOCK(ifp); 1455 1456 return ((struct in6_ifaddr *)ifa); 1457 } 1458 1459 1460 /* 1461 * find the interface address corresponding to a given IPv6 address. 1462 * ifaddr is returned referenced. 1463 */ 1464 struct in6_ifaddr * 1465 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1466 { 1467 struct rm_priotracker in6_ifa_tracker; 1468 struct in6_ifaddr *ia; 1469 1470 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1471 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1472 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1473 if (zoneid != 0 && 1474 zoneid != ia->ia_addr.sin6_scope_id) 1475 continue; 1476 ifa_ref(&ia->ia_ifa); 1477 break; 1478 } 1479 } 1480 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1481 return (ia); 1482 } 1483 1484 /* 1485 * find the internet address corresponding to a given interface and address. 1486 * ifaddr is returned referenced. 1487 */ 1488 struct in6_ifaddr * 1489 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1490 { 1491 struct ifaddr *ifa; 1492 1493 IF_ADDR_RLOCK(ifp); 1494 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1495 if (ifa->ifa_addr->sa_family != AF_INET6) 1496 continue; 1497 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1498 ifa_ref(ifa); 1499 break; 1500 } 1501 } 1502 IF_ADDR_RUNLOCK(ifp); 1503 1504 return ((struct in6_ifaddr *)ifa); 1505 } 1506 1507 /* 1508 * Find a link-local scoped address on ifp and return it if any. 1509 */ 1510 struct in6_ifaddr * 1511 in6ifa_llaonifp(struct ifnet *ifp) 1512 { 1513 struct sockaddr_in6 *sin6; 1514 struct ifaddr *ifa; 1515 1516 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1517 return (NULL); 1518 IF_ADDR_RLOCK(ifp); 1519 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1520 if (ifa->ifa_addr->sa_family != AF_INET6) 1521 continue; 1522 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1523 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1524 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1525 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1526 break; 1527 } 1528 IF_ADDR_RUNLOCK(ifp); 1529 1530 return ((struct in6_ifaddr *)ifa); 1531 } 1532 1533 /* 1534 * Convert IP6 address to printable (loggable) representation. Caller 1535 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1536 */ 1537 static char digits[] = "0123456789abcdef"; 1538 char * 1539 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1540 { 1541 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1542 char *cp; 1543 const u_int16_t *a = (const u_int16_t *)addr; 1544 const u_int8_t *d; 1545 int dcolon = 0, zero = 0; 1546 1547 cp = ip6buf; 1548 1549 for (i = 0; i < 8; i++) { 1550 if (*(a + i) == 0) { 1551 cnt++; 1552 if (cnt == 1) 1553 idx = i; 1554 } 1555 else if (maxcnt < cnt) { 1556 maxcnt = cnt; 1557 index = idx; 1558 cnt = 0; 1559 } 1560 } 1561 if (maxcnt < cnt) { 1562 maxcnt = cnt; 1563 index = idx; 1564 } 1565 1566 for (i = 0; i < 8; i++) { 1567 if (dcolon == 1) { 1568 if (*a == 0) { 1569 if (i == 7) 1570 *cp++ = ':'; 1571 a++; 1572 continue; 1573 } else 1574 dcolon = 2; 1575 } 1576 if (*a == 0) { 1577 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1578 if (i == 0) 1579 *cp++ = ':'; 1580 *cp++ = ':'; 1581 dcolon = 1; 1582 } else { 1583 *cp++ = '0'; 1584 *cp++ = ':'; 1585 } 1586 a++; 1587 continue; 1588 } 1589 d = (const u_char *)a; 1590 /* Try to eliminate leading zeros in printout like in :0001. */ 1591 zero = 1; 1592 *cp = digits[*d >> 4]; 1593 if (*cp != '0') { 1594 zero = 0; 1595 cp++; 1596 } 1597 *cp = digits[*d++ & 0xf]; 1598 if (zero == 0 || (*cp != '0')) { 1599 zero = 0; 1600 cp++; 1601 } 1602 *cp = digits[*d >> 4]; 1603 if (zero == 0 || (*cp != '0')) { 1604 zero = 0; 1605 cp++; 1606 } 1607 *cp++ = digits[*d & 0xf]; 1608 *cp++ = ':'; 1609 a++; 1610 } 1611 *--cp = '\0'; 1612 return (ip6buf); 1613 } 1614 1615 int 1616 in6_localaddr(struct in6_addr *in6) 1617 { 1618 struct rm_priotracker in6_ifa_tracker; 1619 struct in6_ifaddr *ia; 1620 1621 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1622 return 1; 1623 1624 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1625 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1626 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1627 &ia->ia_prefixmask.sin6_addr)) { 1628 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1629 return 1; 1630 } 1631 } 1632 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1633 1634 return (0); 1635 } 1636 1637 /* 1638 * Return 1 if an internet address is for the local host and configured 1639 * on one of its interfaces. 1640 */ 1641 int 1642 in6_localip(struct in6_addr *in6) 1643 { 1644 struct rm_priotracker in6_ifa_tracker; 1645 struct in6_ifaddr *ia; 1646 1647 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1648 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1649 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1650 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1651 return (1); 1652 } 1653 } 1654 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1655 return (0); 1656 } 1657 1658 /* 1659 * Return 1 if an internet address is configured on an interface. 1660 */ 1661 int 1662 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1663 { 1664 struct in6_addr in6; 1665 struct ifaddr *ifa; 1666 struct in6_ifaddr *ia6; 1667 1668 in6 = *addr; 1669 if (in6_clearscope(&in6)) 1670 return (0); 1671 in6_setscope(&in6, ifp, NULL); 1672 1673 IF_ADDR_RLOCK(ifp); 1674 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1675 if (ifa->ifa_addr->sa_family != AF_INET6) 1676 continue; 1677 ia6 = (struct in6_ifaddr *)ifa; 1678 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1679 IF_ADDR_RUNLOCK(ifp); 1680 return (1); 1681 } 1682 } 1683 IF_ADDR_RUNLOCK(ifp); 1684 1685 return (0); 1686 } 1687 1688 int 1689 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1690 { 1691 struct rm_priotracker in6_ifa_tracker; 1692 struct in6_ifaddr *ia; 1693 1694 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1695 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1696 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1697 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1698 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1699 return (1); /* true */ 1700 } 1701 break; 1702 } 1703 } 1704 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1705 1706 return (0); /* false */ 1707 } 1708 1709 /* 1710 * return length of part which dst and src are equal 1711 * hard coding... 1712 */ 1713 int 1714 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1715 { 1716 int match = 0; 1717 u_char *s = (u_char *)src, *d = (u_char *)dst; 1718 u_char *lim = s + 16, r; 1719 1720 while (s < lim) 1721 if ((r = (*d++ ^ *s++)) != 0) { 1722 while (r < 128) { 1723 match++; 1724 r <<= 1; 1725 } 1726 break; 1727 } else 1728 match += 8; 1729 return match; 1730 } 1731 1732 /* XXX: to be scope conscious */ 1733 int 1734 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1735 { 1736 int bytelen, bitlen; 1737 1738 /* sanity check */ 1739 if (0 > len || len > 128) { 1740 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1741 len); 1742 return (0); 1743 } 1744 1745 bytelen = len / 8; 1746 bitlen = len % 8; 1747 1748 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1749 return (0); 1750 if (bitlen != 0 && 1751 p1->s6_addr[bytelen] >> (8 - bitlen) != 1752 p2->s6_addr[bytelen] >> (8 - bitlen)) 1753 return (0); 1754 1755 return (1); 1756 } 1757 1758 void 1759 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1760 { 1761 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1762 int bytelen, bitlen, i; 1763 1764 /* sanity check */ 1765 if (0 > len || len > 128) { 1766 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1767 len); 1768 return; 1769 } 1770 1771 bzero(maskp, sizeof(*maskp)); 1772 bytelen = len / 8; 1773 bitlen = len % 8; 1774 for (i = 0; i < bytelen; i++) 1775 maskp->s6_addr[i] = 0xff; 1776 if (bitlen) 1777 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1778 } 1779 1780 /* 1781 * return the best address out of the same scope. if no address was 1782 * found, return the first valid address from designated IF. 1783 */ 1784 struct in6_ifaddr * 1785 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1786 { 1787 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1788 struct ifaddr *ifa; 1789 struct in6_ifaddr *besta = NULL; 1790 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1791 1792 dep[0] = dep[1] = NULL; 1793 1794 /* 1795 * We first look for addresses in the same scope. 1796 * If there is one, return it. 1797 * If two or more, return one which matches the dst longest. 1798 * If none, return one of global addresses assigned other ifs. 1799 */ 1800 IF_ADDR_RLOCK(ifp); 1801 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1802 if (ifa->ifa_addr->sa_family != AF_INET6) 1803 continue; 1804 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1805 continue; /* XXX: is there any case to allow anycast? */ 1806 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1807 continue; /* don't use this interface */ 1808 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1809 continue; 1810 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1811 if (V_ip6_use_deprecated) 1812 dep[0] = (struct in6_ifaddr *)ifa; 1813 continue; 1814 } 1815 1816 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1817 /* 1818 * call in6_matchlen() as few as possible 1819 */ 1820 if (besta) { 1821 if (blen == -1) 1822 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1823 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1824 if (tlen > blen) { 1825 blen = tlen; 1826 besta = (struct in6_ifaddr *)ifa; 1827 } 1828 } else 1829 besta = (struct in6_ifaddr *)ifa; 1830 } 1831 } 1832 if (besta) { 1833 ifa_ref(&besta->ia_ifa); 1834 IF_ADDR_RUNLOCK(ifp); 1835 return (besta); 1836 } 1837 1838 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1839 if (ifa->ifa_addr->sa_family != AF_INET6) 1840 continue; 1841 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1842 continue; /* XXX: is there any case to allow anycast? */ 1843 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1844 continue; /* don't use this interface */ 1845 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1846 continue; 1847 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1848 if (V_ip6_use_deprecated) 1849 dep[1] = (struct in6_ifaddr *)ifa; 1850 continue; 1851 } 1852 1853 if (ifa != NULL) 1854 ifa_ref(ifa); 1855 IF_ADDR_RUNLOCK(ifp); 1856 return (struct in6_ifaddr *)ifa; 1857 } 1858 1859 /* use the last-resort values, that are, deprecated addresses */ 1860 if (dep[0]) { 1861 ifa_ref((struct ifaddr *)dep[0]); 1862 IF_ADDR_RUNLOCK(ifp); 1863 return dep[0]; 1864 } 1865 if (dep[1]) { 1866 ifa_ref((struct ifaddr *)dep[1]); 1867 IF_ADDR_RUNLOCK(ifp); 1868 return dep[1]; 1869 } 1870 1871 IF_ADDR_RUNLOCK(ifp); 1872 return NULL; 1873 } 1874 1875 /* 1876 * perform DAD when interface becomes IFF_UP. 1877 */ 1878 void 1879 in6_if_up(struct ifnet *ifp) 1880 { 1881 struct ifaddr *ifa; 1882 struct in6_ifaddr *ia; 1883 1884 IF_ADDR_RLOCK(ifp); 1885 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1886 if (ifa->ifa_addr->sa_family != AF_INET6) 1887 continue; 1888 ia = (struct in6_ifaddr *)ifa; 1889 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1890 /* 1891 * The TENTATIVE flag was likely set by hand 1892 * beforehand, implicitly indicating the need for DAD. 1893 * We may be able to skip the random delay in this 1894 * case, but we impose delays just in case. 1895 */ 1896 nd6_dad_start(ifa, 1897 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1898 } 1899 } 1900 IF_ADDR_RUNLOCK(ifp); 1901 1902 /* 1903 * special cases, like 6to4, are handled in in6_ifattach 1904 */ 1905 in6_ifattach(ifp, NULL); 1906 } 1907 1908 int 1909 in6if_do_dad(struct ifnet *ifp) 1910 { 1911 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1912 return (0); 1913 1914 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1915 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1916 return (0); 1917 1918 /* 1919 * Our DAD routine requires the interface up and running. 1920 * However, some interfaces can be up before the RUNNING 1921 * status. Additionally, users may try to assign addresses 1922 * before the interface becomes up (or running). 1923 * This function returns EAGAIN in that case. 1924 * The caller should mark "tentative" on the address instead of 1925 * performing DAD immediately. 1926 */ 1927 if (!((ifp->if_flags & IFF_UP) && 1928 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1929 return (EAGAIN); 1930 1931 return (1); 1932 } 1933 1934 /* 1935 * Calculate max IPv6 MTU through all the interfaces and store it 1936 * to in6_maxmtu. 1937 */ 1938 void 1939 in6_setmaxmtu(void) 1940 { 1941 unsigned long maxmtu = 0; 1942 struct ifnet *ifp; 1943 1944 IFNET_RLOCK_NOSLEEP(); 1945 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1946 /* this function can be called during ifnet initialization */ 1947 if (!ifp->if_afdata[AF_INET6]) 1948 continue; 1949 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1950 IN6_LINKMTU(ifp) > maxmtu) 1951 maxmtu = IN6_LINKMTU(ifp); 1952 } 1953 IFNET_RUNLOCK_NOSLEEP(); 1954 if (maxmtu) /* update only when maxmtu is positive */ 1955 V_in6_maxmtu = maxmtu; 1956 } 1957 1958 /* 1959 * Provide the length of interface identifiers to be used for the link attached 1960 * to the given interface. The length should be defined in "IPv6 over 1961 * xxx-link" document. Note that address architecture might also define 1962 * the length for a particular set of address prefixes, regardless of the 1963 * link type. As clarified in rfc2462bis, those two definitions should be 1964 * consistent, and those really are as of August 2004. 1965 */ 1966 int 1967 in6_if2idlen(struct ifnet *ifp) 1968 { 1969 switch (ifp->if_type) { 1970 case IFT_ETHER: /* RFC2464 */ 1971 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 1972 case IFT_L2VLAN: /* ditto */ 1973 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 1974 case IFT_INFINIBAND: 1975 return (64); 1976 case IFT_FDDI: /* RFC2467 */ 1977 return (64); 1978 case IFT_PPP: /* RFC2472 */ 1979 return (64); 1980 case IFT_ARCNET: /* RFC2497 */ 1981 return (64); 1982 case IFT_FRELAY: /* RFC2590 */ 1983 return (64); 1984 case IFT_IEEE1394: /* RFC3146 */ 1985 return (64); 1986 case IFT_GIF: 1987 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 1988 case IFT_LOOP: 1989 return (64); /* XXX: is this really correct? */ 1990 default: 1991 /* 1992 * Unknown link type: 1993 * It might be controversial to use the today's common constant 1994 * of 64 for these cases unconditionally. For full compliance, 1995 * we should return an error in this case. On the other hand, 1996 * if we simply miss the standard for the link type or a new 1997 * standard is defined for a new link type, the IFID length 1998 * is very likely to be the common constant. As a compromise, 1999 * we always use the constant, but make an explicit notice 2000 * indicating the "unknown" case. 2001 */ 2002 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2003 return (64); 2004 } 2005 } 2006 2007 #include <sys/sysctl.h> 2008 2009 struct in6_llentry { 2010 struct llentry base; 2011 }; 2012 2013 #define IN6_LLTBL_DEFAULT_HSIZE 32 2014 #define IN6_LLTBL_HASH(k, h) \ 2015 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2016 2017 /* 2018 * Do actual deallocation of @lle. 2019 */ 2020 static void 2021 in6_lltable_destroy_lle_unlocked(struct llentry *lle) 2022 { 2023 2024 LLE_LOCK_DESTROY(lle); 2025 LLE_REQ_DESTROY(lle); 2026 free(lle, M_LLTABLE); 2027 } 2028 2029 /* 2030 * Called by LLE_FREE_LOCKED when number of references 2031 * drops to zero. 2032 */ 2033 static void 2034 in6_lltable_destroy_lle(struct llentry *lle) 2035 { 2036 2037 LLE_WUNLOCK(lle); 2038 in6_lltable_destroy_lle_unlocked(lle); 2039 } 2040 2041 static struct llentry * 2042 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2043 { 2044 struct in6_llentry *lle; 2045 2046 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2047 if (lle == NULL) /* NB: caller generates msg */ 2048 return NULL; 2049 2050 lle->base.r_l3addr.addr6 = *addr6; 2051 lle->base.lle_refcnt = 1; 2052 lle->base.lle_free = in6_lltable_destroy_lle; 2053 LLE_LOCK_INIT(&lle->base); 2054 LLE_REQ_INIT(&lle->base); 2055 callout_init(&lle->base.lle_timer, 1); 2056 2057 return (&lle->base); 2058 } 2059 2060 static int 2061 in6_lltable_match_prefix(const struct sockaddr *saddr, 2062 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2063 { 2064 const struct in6_addr *addr, *mask, *lle_addr; 2065 2066 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2067 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2068 lle_addr = &lle->r_l3addr.addr6; 2069 2070 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2071 return (0); 2072 2073 if (lle->la_flags & LLE_IFADDR) { 2074 2075 /* 2076 * Delete LLE_IFADDR records IFF address & flag matches. 2077 * Note that addr is the interface address within prefix 2078 * being matched. 2079 */ 2080 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2081 (flags & LLE_STATIC) != 0) 2082 return (1); 2083 return (0); 2084 } 2085 2086 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2087 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2088 return (1); 2089 2090 return (0); 2091 } 2092 2093 static void 2094 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2095 { 2096 struct ifnet *ifp; 2097 2098 LLE_WLOCK_ASSERT(lle); 2099 KASSERT(llt != NULL, ("lltable is NULL")); 2100 2101 /* Unlink entry from table */ 2102 if ((lle->la_flags & LLE_LINKED) != 0) { 2103 2104 ifp = llt->llt_ifp; 2105 IF_AFDATA_WLOCK_ASSERT(ifp); 2106 lltable_unlink_entry(llt, lle); 2107 } 2108 2109 if (callout_stop(&lle->lle_timer) > 0) 2110 LLE_REMREF(lle); 2111 2112 llentry_free(lle); 2113 } 2114 2115 static int 2116 in6_lltable_rtcheck(struct ifnet *ifp, 2117 u_int flags, 2118 const struct sockaddr *l3addr) 2119 { 2120 const struct sockaddr_in6 *sin6; 2121 struct nhop6_basic nh6; 2122 struct in6_addr dst; 2123 uint32_t scopeid; 2124 int error; 2125 char ip6buf[INET6_ADDRSTRLEN]; 2126 int fibnum; 2127 2128 KASSERT(l3addr->sa_family == AF_INET6, 2129 ("sin_family %d", l3addr->sa_family)); 2130 2131 sin6 = (const struct sockaddr_in6 *)l3addr; 2132 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2133 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2134 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2135 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2136 struct ifaddr *ifa; 2137 /* 2138 * Create an ND6 cache for an IPv6 neighbor 2139 * that is not covered by our own prefix. 2140 */ 2141 ifa = ifaof_ifpforaddr(l3addr, ifp); 2142 if (ifa != NULL) { 2143 ifa_free(ifa); 2144 return 0; 2145 } 2146 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2147 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2148 return EINVAL; 2149 } 2150 return 0; 2151 } 2152 2153 /* 2154 * Called by the datapath to indicate that the entry was used. 2155 */ 2156 static void 2157 in6_lltable_mark_used(struct llentry *lle) 2158 { 2159 2160 LLE_REQ_LOCK(lle); 2161 lle->r_skip_req = 0; 2162 2163 /* 2164 * Set the hit time so the callback function 2165 * can determine the remaining time before 2166 * transiting to the DELAY state. 2167 */ 2168 lle->lle_hittime = time_uptime; 2169 LLE_REQ_UNLOCK(lle); 2170 } 2171 2172 static inline uint32_t 2173 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2174 { 2175 2176 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2177 } 2178 2179 static uint32_t 2180 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2181 { 2182 2183 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2184 } 2185 2186 static void 2187 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2188 { 2189 struct sockaddr_in6 *sin6; 2190 2191 sin6 = (struct sockaddr_in6 *)sa; 2192 bzero(sin6, sizeof(*sin6)); 2193 sin6->sin6_family = AF_INET6; 2194 sin6->sin6_len = sizeof(*sin6); 2195 sin6->sin6_addr = lle->r_l3addr.addr6; 2196 } 2197 2198 static inline struct llentry * 2199 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2200 { 2201 struct llentry *lle; 2202 struct llentries *lleh; 2203 u_int hashidx; 2204 2205 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2206 lleh = &llt->lle_head[hashidx]; 2207 LIST_FOREACH(lle, lleh, lle_next) { 2208 if (lle->la_flags & LLE_DELETED) 2209 continue; 2210 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2211 break; 2212 } 2213 2214 return (lle); 2215 } 2216 2217 static void 2218 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2219 { 2220 2221 lle->la_flags |= LLE_DELETED; 2222 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2223 #ifdef DIAGNOSTIC 2224 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2225 #endif 2226 llentry_free(lle); 2227 } 2228 2229 static struct llentry * 2230 in6_lltable_alloc(struct lltable *llt, u_int flags, 2231 const struct sockaddr *l3addr) 2232 { 2233 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2234 struct ifnet *ifp = llt->llt_ifp; 2235 struct llentry *lle; 2236 char linkhdr[LLE_MAX_LINKHDR]; 2237 size_t linkhdrsize; 2238 int lladdr_off; 2239 2240 KASSERT(l3addr->sa_family == AF_INET6, 2241 ("sin_family %d", l3addr->sa_family)); 2242 2243 /* 2244 * A route that covers the given address must have 2245 * been installed 1st because we are doing a resolution, 2246 * verify this. 2247 */ 2248 if (!(flags & LLE_IFADDR) && 2249 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2250 return (NULL); 2251 2252 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2253 if (lle == NULL) { 2254 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2255 return (NULL); 2256 } 2257 lle->la_flags = flags; 2258 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2259 linkhdrsize = LLE_MAX_LINKHDR; 2260 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2261 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2262 in6_lltable_destroy_lle_unlocked(lle); 2263 return (NULL); 2264 } 2265 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2266 lladdr_off); 2267 lle->la_flags |= LLE_STATIC; 2268 } 2269 2270 if ((lle->la_flags & LLE_STATIC) != 0) 2271 lle->ln_state = ND6_LLINFO_REACHABLE; 2272 2273 return (lle); 2274 } 2275 2276 static struct llentry * 2277 in6_lltable_lookup(struct lltable *llt, u_int flags, 2278 const struct sockaddr *l3addr) 2279 { 2280 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2281 struct llentry *lle; 2282 2283 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2284 KASSERT(l3addr->sa_family == AF_INET6, 2285 ("sin_family %d", l3addr->sa_family)); 2286 2287 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2288 2289 if (lle == NULL) 2290 return (NULL); 2291 2292 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 2293 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 2294 flags)); 2295 2296 if (flags & LLE_UNLOCKED) 2297 return (lle); 2298 2299 if (flags & LLE_EXCLUSIVE) 2300 LLE_WLOCK(lle); 2301 else 2302 LLE_RLOCK(lle); 2303 return (lle); 2304 } 2305 2306 static int 2307 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2308 struct sysctl_req *wr) 2309 { 2310 struct ifnet *ifp = llt->llt_ifp; 2311 /* XXX stack use */ 2312 struct { 2313 struct rt_msghdr rtm; 2314 struct sockaddr_in6 sin6; 2315 /* 2316 * ndp.c assumes that sdl is word aligned 2317 */ 2318 #ifdef __LP64__ 2319 uint32_t pad; 2320 #endif 2321 struct sockaddr_dl sdl; 2322 } ndpc; 2323 struct sockaddr_dl *sdl; 2324 int error; 2325 2326 bzero(&ndpc, sizeof(ndpc)); 2327 /* skip deleted entries */ 2328 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2329 return (0); 2330 /* Skip if jailed and not a valid IP of the prison. */ 2331 lltable_fill_sa_entry(lle, 2332 (struct sockaddr *)&ndpc.sin6); 2333 if (prison_if(wr->td->td_ucred, 2334 (struct sockaddr *)&ndpc.sin6) != 0) 2335 return (0); 2336 /* 2337 * produce a msg made of: 2338 * struct rt_msghdr; 2339 * struct sockaddr_in6 (IPv6) 2340 * struct sockaddr_dl; 2341 */ 2342 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2343 ndpc.rtm.rtm_version = RTM_VERSION; 2344 ndpc.rtm.rtm_type = RTM_GET; 2345 ndpc.rtm.rtm_flags = RTF_UP; 2346 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2347 if (V_deembed_scopeid) 2348 sa6_recoverscope(&ndpc.sin6); 2349 2350 /* publish */ 2351 if (lle->la_flags & LLE_PUB) 2352 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2353 2354 sdl = &ndpc.sdl; 2355 sdl->sdl_family = AF_LINK; 2356 sdl->sdl_len = sizeof(*sdl); 2357 sdl->sdl_index = ifp->if_index; 2358 sdl->sdl_type = ifp->if_type; 2359 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2360 sdl->sdl_alen = ifp->if_addrlen; 2361 bcopy(lle->ll_addr, LLADDR(sdl), 2362 ifp->if_addrlen); 2363 } else { 2364 sdl->sdl_alen = 0; 2365 bzero(LLADDR(sdl), ifp->if_addrlen); 2366 } 2367 if (lle->la_expire != 0) 2368 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2369 lle->lle_remtime / hz + 2370 time_second - time_uptime; 2371 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2372 if (lle->la_flags & LLE_STATIC) 2373 ndpc.rtm.rtm_flags |= RTF_STATIC; 2374 if (lle->la_flags & LLE_IFADDR) 2375 ndpc.rtm.rtm_flags |= RTF_PINNED; 2376 if (lle->ln_router != 0) 2377 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2378 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2379 /* Store state in rmx_weight value */ 2380 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2381 ndpc.rtm.rtm_index = ifp->if_index; 2382 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2383 2384 return (error); 2385 } 2386 2387 static struct lltable * 2388 in6_lltattach(struct ifnet *ifp) 2389 { 2390 struct lltable *llt; 2391 2392 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2393 llt->llt_af = AF_INET6; 2394 llt->llt_ifp = ifp; 2395 2396 llt->llt_lookup = in6_lltable_lookup; 2397 llt->llt_alloc_entry = in6_lltable_alloc; 2398 llt->llt_delete_entry = in6_lltable_delete_entry; 2399 llt->llt_dump_entry = in6_lltable_dump_entry; 2400 llt->llt_hash = in6_lltable_hash; 2401 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2402 llt->llt_free_entry = in6_lltable_free_entry; 2403 llt->llt_match_prefix = in6_lltable_match_prefix; 2404 llt->llt_mark_used = in6_lltable_mark_used; 2405 lltable_link(llt); 2406 2407 return (llt); 2408 } 2409 2410 void * 2411 in6_domifattach(struct ifnet *ifp) 2412 { 2413 struct in6_ifextra *ext; 2414 2415 /* There are not IPv6-capable interfaces. */ 2416 switch (ifp->if_type) { 2417 case IFT_PFLOG: 2418 case IFT_PFSYNC: 2419 case IFT_USB: 2420 return (NULL); 2421 } 2422 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2423 bzero(ext, sizeof(*ext)); 2424 2425 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2426 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2427 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2428 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2429 2430 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2431 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2432 M_WAITOK); 2433 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2434 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2435 2436 ext->nd_ifinfo = nd6_ifattach(ifp); 2437 ext->scope6_id = scope6_ifattach(ifp); 2438 ext->lltable = in6_lltattach(ifp); 2439 2440 ext->mld_ifinfo = mld_domifattach(ifp); 2441 2442 return ext; 2443 } 2444 2445 int 2446 in6_domifmtu(struct ifnet *ifp) 2447 { 2448 if (ifp->if_afdata[AF_INET6] == NULL) 2449 return ifp->if_mtu; 2450 2451 return (IN6_LINKMTU(ifp)); 2452 } 2453 2454 void 2455 in6_domifdetach(struct ifnet *ifp, void *aux) 2456 { 2457 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2458 2459 mld_domifdetach(ifp); 2460 scope6_ifdetach(ext->scope6_id); 2461 nd6_ifdetach(ifp, ext->nd_ifinfo); 2462 lltable_free(ext->lltable); 2463 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2464 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2465 free(ext->in6_ifstat, M_IFADDR); 2466 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2467 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2468 free(ext->icmp6_ifstat, M_IFADDR); 2469 free(ext, M_IFADDR); 2470 } 2471 2472 /* 2473 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2474 * v4 mapped addr or v4 compat addr 2475 */ 2476 void 2477 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2478 { 2479 2480 bzero(sin, sizeof(*sin)); 2481 sin->sin_len = sizeof(struct sockaddr_in); 2482 sin->sin_family = AF_INET; 2483 sin->sin_port = sin6->sin6_port; 2484 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2485 } 2486 2487 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2488 void 2489 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2490 { 2491 bzero(sin6, sizeof(*sin6)); 2492 sin6->sin6_len = sizeof(struct sockaddr_in6); 2493 sin6->sin6_family = AF_INET6; 2494 sin6->sin6_port = sin->sin_port; 2495 sin6->sin6_addr.s6_addr32[0] = 0; 2496 sin6->sin6_addr.s6_addr32[1] = 0; 2497 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2498 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2499 } 2500 2501 /* Convert sockaddr_in6 into sockaddr_in. */ 2502 void 2503 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2504 { 2505 struct sockaddr_in *sin_p; 2506 struct sockaddr_in6 sin6; 2507 2508 /* 2509 * Save original sockaddr_in6 addr and convert it 2510 * to sockaddr_in. 2511 */ 2512 sin6 = *(struct sockaddr_in6 *)nam; 2513 sin_p = (struct sockaddr_in *)nam; 2514 in6_sin6_2_sin(sin_p, &sin6); 2515 } 2516 2517 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2518 void 2519 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2520 { 2521 struct sockaddr_in *sin_p; 2522 struct sockaddr_in6 *sin6_p; 2523 2524 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2525 sin_p = (struct sockaddr_in *)*nam; 2526 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2527 free(*nam, M_SONAME); 2528 *nam = (struct sockaddr *)sin6_p; 2529 } 2530